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니켈 - 아연 페라이트복합재의 자기적특성과 전파흡수특성
조성백(S. B. Cho),오재희(J. H. Oh) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.2
The relationship between magnetic parameter and microwave absorbing performance evaluation factor of electomagnetic wave absorber such as matching frequency, matching thickness were investigated for Ni-Zn ferrite composites. It was identified that the maximum value of μ_r is shift to low frequency with decrese Ni / Zn ratio and the value of μ_r is maximum in the case of Ni / Zn=1. All Ni-Zn ferrite composites in this study have two matching frequencies in 1-12 ㎓ frequency. It can be suggested that f_(m1) is proportional to resonance frequency and f_(m2) is proportional to the saturation magnetization.
비화학양론적 조성이 니켈 - 아연 페라이트의 전파흡수특성에 미치는 영향
조성백(S. B. Cho),오재희(J. H. Oh) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The systematic variation of complex permeability and complex permittivity and their relationship with microwave absorbing properties are investigated in sintered Ni-Zn ferrites of non-stoichiometric composition. The specimens of (Ni_(0.5)Zn_(0.5)O)_(1-x)(Fe₂O₃)_(1+x) spinels were prepared by a conventional ceramic processing technique. In the present study, complex permeability and permittivity can be controlled by the variation of α-Fe₂O₃ contents in the spinel lattice. The primary effect of the excess α-Fe₂O₃ is to increase the dielectric constant, while the notable decrease of magnetic loss is observed in the iron-deficient ferrites. The results suggest that the matching frequency and matching thickness could be controlled by the variation of α-Fe₂O₃ contents in the Ni-Zn ferrite.
육성비육돈사의 피트에 살포한 프리바이오틱의 냄새저감 효과
조성백 ( Sungback Cho ),임태우 ( Tae-woo Lim ),한덕우 ( Deug-woo Han ),황옥화 ( Okhwa Hwang ),정민웅 ( Ming-woong Jung ),노환국 ( Whangook Nho ),박진기 ( Jinki Park ),이수협 ( Suhyup Lee ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
돈방면적 360m2, 피트 깊이 80cm의 슬러리돈사에 돈방별로 체중 55∼70kg의 육성비육돈 280두를 2처리(대조구, 시험구)구에 각각 배치하였다. 시험구에는 프리바이오틱을 1회 20kg씩 1주 2회 살포하고, 22일간 시험을 수행하였다. 시험종료 후 처리구 간에 복합악취 희석배수와 냄새기여도(Odor activity value)를 평가한 결과 무처리구 대비 프리바이오틱 처리구에서 복합악취 희석배수 93%, OAV 75% 감소 결과를 얻었다. 또한 축산냄새의 강도에 미치는 물질을 조사한 결과 대조구에서는 황화수소가 47%의 영향을 주었으며, 처리구에서는 노르말부티르산 26%, 스카톨27%의 영향을 받았다. 무처리구 대비 프리바이오틱구에서 냄새물질의 특성별로 가장 크게 감소된 물질의 수준을 살펴보면 황화합물 중에서는 황화수소 95%(대조구 4,456, 처리구 221ppb), 휘발성지방산 중에서는 노르말발레르산 81%(대조구 186, 처리구 35ppm), 페놀류 중에서는 p-크레졸 62%(대조구 89, 처리구 33ppm) 이었다.
산란계 사료내 CLA 함유 Oil (CLAzen 80) 첨가가 난황내 지방산 조성에 미치는 영향
황보종,장종수,정일병,이병석,김동운,조성백,김희도,배해득,손진혁,홍의철,최낙진,Hwangbo J.,Chang J. S.,Chung I. B.,Lee B. S.,Kim D. U.,Cho S. B.,Kim H. D.,Bae H. D.,Son J. H.,Hong U. C.,Choi N. J. 한국가금학회 2005 韓國家禽學會誌 Vol.32 No.1
본 연구는 oil 형태의 conjugated linoleic acid(CLAzen 80)를 산란계 사료에 수준별로 첨가 급여하였을 때 산란율과 난황내 지방산 조성의 변화를 조사하기 위하여 수행하였다. 59주령의 산란계 72수를 완전임의배치법으로 4개 처리구에 6주간 공시하였다. 처리구는 CLAzen 80를 첨가하지 않은 대조구와 각각 1, 2 및 $3\%$를 첨가구를 두었다. 연구 결과를 살펴보면 산란율은 처리구별 통계적 유의차가 없었지만, 난황내 지방산 조성은 CLAzen 80 첨가에 의하게 크게 영향을 받았다. 난황내 C16:0과 C18:0과 같은 포화 지방산 함량은 CLAzen 80 첨가에 의하여 증가하였으나, 일가불포화지방산인 C18:1 함량은 오히려 감소하였다. 한편, 난황내 C18:2와 C18:3와 같은 다가불포화지방산은 CLAzen 80 급여 2$\~$4주사이에는 모든처리구들에 있어서 그 함량이 일정하게 유지되었다. 그러나, 대조구와 비교하여 CLAzen 80 급여 6주 째에는 난황내 C18:2 함량이 감소하였다. 불포화지방산:포화지방산 비율과 n-6:n-3 불포화지방산 비율은 2$\~$4주 사이에는 처리구별간에 통계적 유의차가 없었고, 6주째 불포화지방산:포화지방산 비율이 CLAzen 80 첨가에 의하여 감소하였다. 한편, 난황내 CLA 함량은 CLAzen 80 첨가수준에 비례하여 증가하였다. 따라서, 산란계 사료 내 CLAzen 80 첨가는 난황내 CLA 함량을 증진시키는 것으로 요약할 수 있다. The objectives of the present study were to investigate the effects of varying levels of dietary oil containing conjugated linoleic acid (CLA) on the egg production and fatty acid composition of egg yolk. Seventy-two 59-wk-old ISA Brown laying hens were randomly allotted to four dietary treatments, each consisting of three replicates with six birds per replicate. There were four treatments that consist of diets containing 0, 1, 2, or $3\%$ commercial CLA-containing oil. Egg production was not significantly different among the dietary treatments at 0, 2, 4, and 6 week. The proportion of saturated fatty acids such as C16:0 and C18:0 in egg yolk were increased, but that of monounsaturated fatty acid C18:1 was decreased by feeding CLA-containing oil supplementation. However, the proportion of polyunsaturated fatty acids such as C18:2 and C18:3 in egg yolk were not different among dietary treatments at 2 and 4 wk of the experiment. At 6 week, the proportion of C18:2 in egg yolk was decreased by feeding CLA-containing oil compared with the control. Polyunsaturated fatty acid:saturated fatty acid (P:S) ratio and n-6:n-3 polyunsaturated fatty acid ratio were similar across the treatments between 2 and 4 week. The P:S ratio was decreased by dietary CLA-containing oil supplementation at 6 week. The proportion of CLA in egg yolk was linearly increased with increasing levels of CLA-containing oil supplementation. In conclusion, dietary supplementation of CLA-containing oil to laying hens increased beneficially increased CLA content in their egg yolk.
조성백,양승학,이준엽,김중곤,전중환,한만희,한덕우,정광화,곽정훈,최동윤,황옥화,Cho, Sung Back,Yang, Seung Hak,Lee, Jun Yeop,Kim, Jung Kon,Jeon, Jung Hwan,Han, Man Hee,Han, Duck Woo,Jeong, Gwang Hwa,Kwag, Jeong Hoon,Choi, Dong Yun,Hwang 한국축산환경학회 2013 한국축산시설환경학회지 Vol.19 No.1
This study was performed to analyse the concentration of odorous compounds in the piggeries. Piggeries for different types of pigs include piglets, growing pigs, gestating and lactating sows. Slurry from these piggeries was sampled every month for chemical analysis. Short chain fatty acid (SCFA) was 9,862 ppm (piglet), 8,410 ppm (growing pigs), 6,791 ppm (fattening pigs), 3,508 ppm (lactating sows) and 1,687 ppm (gestating sows). Branched chain fatty acid (BCFA) was 1,634 ppm (piglet), 1,206 ppm (growing pigs), 868 ppm (fattening pigs), 493 ppm (lactating sows) and 185 ppm (gestating sows). Concentration of phenols was 209 ppm (piglet), 166 ppm (growing pigs), 127 ppm (fattening pigs), 85 ppm (lactating sows) and 36 ppm (gestating sows). Indoles was 18 ppm (piglet), 14 ppm (growing pigs), 8 ppm (fattening pigs), 6 ppm (lactating sows) and 4 ppm (gestating sows). Altogether, concentration of odorous compounds was decreased as pigs got aged.